CSS Properties: How to set the opacity level for a division element

Last update on February 23 2024 13:04:54 (UTC/GMT +8 hours)

Solution:

HTML Code:

<!DOCTYPE html><!-- Declares the document type and version of HTML -->
<html><!-- Begins the HTML document -->
<head><!-- Contains metadata and links to external resources -->
<title>How to set the opacity level for a division element</title><!-- Sets the title of the document -->
<style type="text/css"> /* Starts CSS styling */
div {  /* Selects all div elements */
  background-color: #33C3FF; /* Sets the background color for all div elements */
	} /* Ends the styling for div */

.heavy { /* Selects elements with the class "heavy" */
  opacity: 0.9; /* Sets the opacity level for elements with the class "heavy" */
} /* Ends the styling for .heavy */
</style><!-- Ends CSS styling -->
</head><!-- Ends the head section -->
<body><!-- Begins the body of the document -->
<p>w3resource Tutorial</p><!-- Paragraph element with text content -->
<div class="heavy">The text and the background-color, both are affected by the opacity level but this is very easy to see.</div><!-- Div element with the class "heavy" -->
</body><!-- Ends the body section -->
</html><!-- Ends the HTML document -->

Explanation:

This HTML document demonstrates how to set the opacity level for a division element using CSS.
CSS comments are added to explain each section of the code.
All div elements have a background color of #33C3FF.
The class "heavy" is defined to set an opacity level of 0.9 for elements with this class.
The text and background color of elements with the "heavy" class are affected by the opacity level set.

Live Demo:

See the Pen opacity-answer by w3resource (@w3resource) on CodePen.

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